:root {
  --bg: #0a0b0d;
  --card-bg: #17181c;
  --box-bg: #0d0e11;
  --border: #26282e;
  --text: #f2f3f5;
  --text-dim: #85888f;
  --text-faint: #55585f;
  --accent: #52e6a4;
  --accent-text: #06130d;
  --danger: #ff6b6b;
  --warn: #ffc857;
  --radius-card: 22px;
  --radius-box: 16px;
  --radius-btn: 12px;
  --shadow-card: none;
}

:root[data-theme="light"] {
  --bg: #f2f3f6;
  --card-bg: #ffffff;
  --box-bg: #f4f5f8;
  --border: #e3e5ea;
  --text: #17181c;
  --text-dim: #6b6e76;
  --text-faint: #9498a0;
  --accent: #1fb178;
  --accent-text: #ffffff;
  --danger: #e0333f;
  --warn: #b8790a;
  --shadow-card: 0 20px 40px rgba(20, 22, 30, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  background: var(--bg);
  font-family: "Pretendard", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  padding: 24px;
  transition: background 0.2s ease, color 0.2s ease;
}

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.theme-toggle:active {
  transform: scale(0.92);
}

.theme-toggle .icon {
  width: 18px;
  height: 18px;
}

.icon-moon {
  display: none;
}

:root[data-theme="light"] .icon-sun {
  display: none;
}

:root[data-theme="light"] .icon-moon {
  display: block;
}

.card {
  width: 100%;
  max-width: 460px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 28px 26px 26px;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin-bottom: 18px;
}

.title {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

.subtitle {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-faint);
}

.password-box {
  background: var(--box-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-box);
  padding: 20px 20px 16px;
}

.password-text {
  font-family: "Consolas", "Menlo", monospace;
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.01em;
  word-break: break-all;
  color: var(--text);
  min-height: 1.35em;
}

.password-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
}

#metaInfo {
  font-size: 0.8rem;
  color: var(--text-faint);
}

.copy-btn {
  flex-shrink: 0;
  border: none;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: var(--radius-btn);
  padding: 9px 20px;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.1s ease;
}

.copy-btn:hover {
  filter: brightness(1.08);
}

.copy-btn:active {
  transform: scale(0.96);
}

.copy-msg {
  min-height: 16px;
  margin: 8px 2px 0;
  font-size: 0.78rem;
  color: var(--accent);
  text-align: right;
}

.error-msg {
  min-height: 16px;
  margin: 8px 2px 0;
  font-size: 0.8rem;
  color: var(--danger);
  text-align: center;
}

.row-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.strength-label {
  font-weight: 700;
  color: var(--accent);
}

.strength-track {
  margin-top: 10px;
  height: 6px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}

.strength-fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: var(--accent);
  transition: width 0.25s ease, background 0.25s ease;
}

.length-row {
  margin-top: 24px;
}

.length-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

input[type="range"] {
  width: 100%;
  margin-top: 12px;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 999px;
  background: var(--border);
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
  border: none;
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
  border: none;
  cursor: pointer;
}

input[type="range"]::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: transparent;
}

.range-minmax {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-size: 0.75rem;
  color: var(--text-faint);
}

.toggle-list {
  margin-top: 8px;
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
}

.toggle-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.toggle-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
}

.toggle-desc {
  font-size: 0.78rem;
  color: var(--text-faint);
}

.toggle-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-box {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 7px;
  border: 1.5px solid var(--border);
  background: transparent;
  position: relative;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.toggle-box::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 6px;
  height: 11px;
  border: solid var(--accent-text);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  opacity: 0;
  transition: opacity 0.1s ease;
}

.toggle-input:checked + .toggle-box {
  background: var(--accent);
  border-color: var(--accent);
}

.toggle-input:checked + .toggle-box::after {
  opacity: 1;
}

.toggle-input:focus-visible + .toggle-box {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.generate-btn {
  width: 100%;
  margin-top: 26px;
  padding: 15px;
  border: none;
  border-radius: var(--radius-btn);
  background: var(--accent);
  color: var(--accent-text);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.1s ease;
}

.generate-btn:hover {
  filter: brightness(1.08);
}

.generate-btn:active {
  transform: scale(0.98);
}

.site-footer {
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.footer-links a {
  font-size: 0.82rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-copyright {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-faint);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 16px;
  font-size: 0.85rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.15s ease;
}

.back-link:hover {
  color: var(--accent);
}

.content-page {
  max-width: 620px;
}

.content-page h1 {
  margin: 0 0 6px;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.content-page .page-updated {
  margin: 0 0 24px;
  font-size: 0.78rem;
  color: var(--text-faint);
}

.content-page h2 {
  margin: 28px 0 10px;
  font-size: 1.05rem;
  font-weight: 700;
}

.content-page p {
  margin: 0 0 12px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.content-page ul,
.content-page ol {
  margin: 0 0 12px;
  padding-left: 20px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.content-page li {
  margin-bottom: 6px;
}

.content-page .faq-item {
  margin-bottom: 18px;
}

.content-page .faq-question {
  margin: 0 0 6px;
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--text);
}

.content-page .faq-answer {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.content-page a {
  color: var(--accent);
}